<template>
  <view ref="u-steps-item" :class="[`u-steps-item--${parentData.direction}`]" class="u-steps-item">
    <view v-if="index + 1 < childLength" :class="[`u-steps-item__line--${parentData.direction}`]"
          :style="[lineStyle]" class="u-steps-item__line"></view>
    <view :class="[`u-steps-item__wrapper--${parentData.direction}`, parentData.dot && `u-steps-item__wrapper--${parentData.direction}--dot`]"
          class="u-steps-item__wrapper">
      <slot name="icon">
        <view v-if="parentData.dot" :style="{
						backgroundColor: statusColor
					}" class="u-steps-item__wrapper__dot">

        </view>
        <view v-else-if="parentData.activeIcon || parentData.inactiveIcon" class="u-steps-item__wrapper__icon">
          <u-icon :color="index <= parentData.current ? parentData.activeColor : parentData.inactiveColor"
                  :name="index <= parentData.current ? parentData.activeIcon : parentData.inactiveIcon"
                  :size="iconSize">
          </u-icon>
        </view>
        <view v-else :style="{
						backgroundColor: statusClass === 'process' ? parentData.activeColor : 'transparent',
						borderColor: statusColor
					}" class="u-steps-item__wrapper__circle">
          <text v-if="statusClass === 'process' || statusClass === 'wait'"
                :style="{
							color: index == parentData.current ? '#ffffff' : parentData.inactiveColor
						}" class="u-steps-item__wrapper__circle__text">{{ index + 1 }}
          </text>
          <u-icon v-else :color="statusClass === 'error' ? 'error' : parentData.activeColor" :name="statusClass === 'error' ? 'close' : 'checkmark'"
                  size="12"></u-icon>
        </view>
      </slot>
    </view>
    <view :class="[`u-steps-item__content--${parentData.direction}`]" :style="[contentStyle]"
          class="u-steps-item__content">
      <u--text :size="parentData.current == index ? 14 : 13" :text="title" :type="parentData.current == index ? 'main' : 'content'"
               lineHeight="20px"></u--text>
      <slot name="desc">
        <u--text :text="desc" size="12" type="tips"></u--text>
      </slot>
    </view>
    <!-- <view
        class="u-steps-item__line"
        v-if="showLine && parentData.direction === 'column'"
      :class="[`u-steps-item__line--${parentData.direction}`]"
        :style="[lineStyle]"
    ></view> -->
  </view>
</template>

<script>
import props from './props.js';
// #ifdef APP-NVUE
const dom = uni.requireNativePlugin('dom')
// #endif
/**
 * StepsItem 步骤条的子组件
 * @description 本组件需要和u-steps配合使用
 * @tutorial https://uviewui.com/components/steps.html
 * @property {String}      title      标题文字
 * @property {String}      current      描述文本
 * @property {String | Number}  iconSize    图标大小  (默认 17 )
 * @property {Boolean}      error      当前步骤是否处于失败状态  (默认 false )
 * @example <u-steps current="0"><u-steps-item title="已出库" desc="10:35" ></u-steps-item></u-steps>
 */
export default {
  name: 'u-steps-item',
  mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
  data() {
    return {
      index: 0,
      childLength: 0,
      showLine: false,
      size: {
        height: 0,
        width: 0
      },
      parentData: {
        direction: 'row',
        current: 0,
        activeColor: '',
        inactiveColor: '',
        activeIcon: '',
        inactiveIcon: '',
        dot: false
      }
    }
  },
  watch: {
    'parentData'(newValue, oldValue) {
    }
  },
  created() {
    this.init()
  },
  computed: {
    lineStyle() {
      const style = {}
      if (this.parentData.direction === 'row') {
        style.width = this.size.width + 'px'
        style.left = this.size.width / 2 + 'px'
      } else {
        style.height = this.size.height + 'px'
        // style.top = this.size.height / 2 + 'px'
      }
      style.backgroundColor = this.parent.children?.[this.index + 1]?.error ? uni.$u.color.error : this.index <
      this
          .parentData
          .current ? this.parentData.activeColor : this.parentData.inactiveColor
      return style
    },
    statusClass() {
      const {
        index,
        error
      } = this
      const {
        current
      } = this.parentData
      if (current == index) {
        return error === true ? 'error' : 'process'
      } else if (error) {
        return 'error'
      } else if (current > index) {
        return 'finish'
      } else {
        return 'wait'
      }
    },
    statusColor() {
      let color = ''
      switch (this.statusClass) {
        case 'finish':
          color = this.parentData.activeColor
          break
        case 'error':
          color = uni.$u.color.error
          break
        case 'process':
          color = this.parentData.dot ? this.parentData.activeColor : 'transparent'
          break
        default:
          color = this.parentData.inactiveColor
          break
      }
      return color
    },
    contentStyle() {
      const style = {}
      if (this.parentData.direction === 'column') {
        style.marginLeft = this.parentData.dot ? '2px' : '6px'
        style.marginTop = this.parentData.dot ? '0px' : '6px'
      } else {
        style.marginTop = this.parentData.dot ? '2px' : '6px'
        style.marginLeft = this.parentData.dot ? '2px' : '6px'
      }

      return style
    }
  },
  mounted() {
    this.parent && this.parent.updateFromChild()
    uni.$u.sleep().then(() => {
      this.getStepsItemRect()
    })
  },
  methods: {
    init() {
      // 初始化数据
      this.updateParentData()
      if (!this.parent) {
        return uni.$u.error('u-steps-item必须要搭配u-steps组件使用')
      }
      this.index = this.parent.children.indexOf(this)
      this.childLength = this.parent.children.length
    },
    updateParentData() {
      // 此方法在mixin中
      this.getParentData('u-steps')
    },
    // 父组件数据发生变化
    updateFromParent() {
      this.init()
    },
    // 获取组件的尺寸，用于设置横线的位置
    getStepsItemRect() {
      // #ifndef APP-NVUE
      this.$uGetRect('.u-steps-item').then(size => {
        this.size = size
      })
      // #endif

      // #ifdef APP-NVUE
      dom.getComponentRect(this.$refs['u-steps-item'], res => {
        const {
          size
        } = res
        this.size = size
      })
      // #endif
    }
  }
}
</script>

<style lang="scss" scoped>
@import "../../libs/css/components.scss";

.u-steps-item {
  flex: 1;
  @include flex;

  &--row {
    flex-direction: column;
    align-items: center;
    position: relative;
  }

  &--column {
    position: relative;
    flex-direction: row;
    justify-content: flex-start;
    padding-bottom: 5px;
  }

  &__wrapper {
    @include flex;
    justify-content: center;
    align-items: center;
    position: relative;
    background-color: #fff;

    &--column {
      width: 20px;
      height: 32px;

      &--dot {
        height: 20px;
        width: 20px;
      }
    }

    &--row {
      width: 32px;
      height: 20px;

      &--dot {
        width: 20px;
        height: 20px;
      }
    }

    &__circle {
      width: 20px;
      height: 20px;
      /* #ifndef APP-NVUE */
      box-sizing: border-box;
      flex-shrink: 0;
      /* #endif */
      border-radius: 100px;
      border-width: 1px;
      border-color: $u-tips-color;
      border-style: solid;
      @include flex(row);
      align-items: center;
      justify-content: center;
      transition: background-color 0.3s;

      &__text {
        color: $u-tips-color;
        font-size: 11px;
        @include flex(row);
        align-items: center;
        justify-content: center;
        text-align: center;
        line-height: 11px;
      }
    }

    &__dot {
      width: 10px;
      height: 10px;
      border-radius: 100px;
      background-color: $u-content-color;
    }
  }

  &__content {
    @include flex;
    flex: 1;

    &--row {
      flex-direction: column;
      align-items: center;
    }

    &--column {
      flex-direction: column;
      margin-left: 6px;
    }
  }

  &__line {
    position: absolute;
    background: $u-tips-color;

    &--row {
      top: 10px;
      height: 1px;
    }

    &--column {
      width: 1px;
      left: 10px;
    }
  }
}
</style>
